WO2022203171A1 - 직류 전열기구의 스마트 온도제어장치 - Google Patents
직류 전열기구의 스마트 온도제어장치 Download PDFInfo
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- WO2022203171A1 WO2022203171A1 PCT/KR2022/000202 KR2022000202W WO2022203171A1 WO 2022203171 A1 WO2022203171 A1 WO 2022203171A1 KR 2022000202 W KR2022000202 W KR 2022000202W WO 2022203171 A1 WO2022203171 A1 WO 2022203171A1
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- temperature
- voltage
- temperature sensing
- control device
- heating
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- 238000005485 electric heating Methods 0.000 title claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 201
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- 238000013021 overheating Methods 0.000 abstract description 21
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/42—Heating elements having the shape of rods or tubes non-flexible
- H05B3/46—Heating elements having the shape of rods or tubes non-flexible heating conductor mounted on insulating base
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0202—Switches
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
- H05B1/0275—Heating of spaces, e.g. rooms, wardrobes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
- H05B3/56—Heating cables
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/035—Electrical circuits used in resistive heating apparatus
Definitions
- the present invention relates to a smart temperature control device that can accurately detect temperature over the entire section along the heating wire by using a heating wire using a thermosensitive insulating resin in a heating appliance using a DC power source.
- An electric blanket for the purpose of electric heating using an AC power source a heating wire is used to heat the electric blanket.
- the heating wire In electric heating devices such as electric blankets, current flows through the heating wire to keep the temperature of the carpet warm by the generated heat. When the current flows through the heating wire, heat is generated and the temperature rises. If the temperature is not controlled properly, the temperature of the heating wire continues to rise, which can cause burns and fire due to overheating. Therefore, it is necessary to precisely control the temperature through the temperature control device so that the heating part of the electric heating device always stays within the desired temperature range. According to the current Electrical Appliances Safety Standards Act, the maximum temperature radiated from electric heaters is stipulated to be 95 degrees or less.
- the method of controlling the temperature of the heating device is a method of controlling the supply power by sensing the temperature by separately installing a temperature sensor that detects the temperature of the heating wire and a bimetal sensor, which is a temperature overheating prevention device, for each measurement part.
- a method of controlling the temperature by placing a thermosensitive insulating resin whose impedance decreases when the temperature rises between the thermosensitive wires and sensing the change in the alternating current flowing through the thermosensitive insulating resin through the thermosensitive insulating resin has been mainly studied.
- the temperature control can work smoothly when the electric blanket is unfolded in a normal state, but a heavy object is placed on the electric blanket, or a temperature sensor or bimetal sensor is not installed. In this folded state, the temperature may not be sensed properly, resulting in local overheating.
- a heating wire is used for an area of 100cm x 180cm in case of one person and a length of 25m in case of two people and about 34m in length in an area of 140cm x 180cm in case of two people. It is difficult to evenly install the bimetal sensor in terms of the manufacturing process or in terms of economy. Accordingly, in general, in the case of an electric blanket, a temperature sensor or a bimetal sensor is installed in 2-3 places. In the case of such an electric blanket, when the temperature sensor or the bimetal is not installed, or when it is overheated, it has a structural feature in that the correct temperature is not detected.
- the outside of the heating wire is insulated with a nylon resin whose impedance changes depending on the temperature, and the heat-sensitive wire is wound on the outside of the nylon resin and then covered with an external insulation material.
- thermosensitive insulating resin since the heating wire and the heating wire are installed in parallel, it is possible to detect the temperature in all sections where the heating wire is installed and to prevent local overheating. Compared to the method using the bimetal, it can be said that the method is superior in terms of workability, cost, and safety.
- thermosensitive insulating resin The heat-sensitive wire method using such a thermosensitive insulating resin has been mainly studied as a temperature sensing device for an electric heating device using an AC power source that allows current to flow through the dielectric, which is an insulating resin, due to the characteristic that the impedance of the insulating dielectric decreases when the temperature rises.
- thermosensitive insulating resin a device for controlling the heating temperature by a heating wire method using a thermosensitive insulating resin has not been developed.
- the material used as the temperature-sensitive insulating resin is mainly nylon, and nylon is a dielectric.
- DC electric heaters such as electric blankets and rugs that do not generate electromagnetic waves and have good portability have been developed using DC DC power.
- Korean Utility Model Publication No. 20-0296244 introduces a DC thermostat for an electronic mat characterized in that the thyristor is triggered at zero volts using a microcontroller after converting the AC input voltage to DC.
- the voltage used is mainly 5V ⁇ 24V. Compared to AC 220V, the voltage is lower than that of AC 220V, so the safety is excellent. It has the advantage of being portable.
- the developed DC heating products mainly use a temperature control method using a temperature sensor and a bimetal sensor for temperature control.
- this bimetal method has poor workability as it includes the problem of not being easily detected when the folded part or local overheating occurs as described above, and the need to install and connect a sensor when laying out the heating cable, and in terms of manufacturing cost. There is a disadvantageous problem.
- An object of the present invention is to provide an economical smart temperature control device that can accurately control temperature and prevent local overheating by using a heating wire using a thermosensitive insulating resin for a DC electric heating device.
- Another object of the present invention is to provide a temperature control device for a DC electric heater that can safely protect the electric heater from local heating of the DC electric heater, a failure of a heating wire, and a failure of a power device for temperature control, and can be manufactured economically.
- a temperature control device for a heating device using a DC power source, the heating cable of the heating device comprising: a heating wire coated with a thermosensitive insulating resin and heated by the DC power supply; and a heat-sensitive wire spirally wound outside the coated temperature-sensitive insulating resin.
- the temperature control device includes a heating cycle in which the DC power is supplied to the heating wire through a power control element to heat the heating wire, and a temperature sensing cycle in which a pulse signal voltage is supplied to the heating wire to generate a temperature sensing current.
- the temperature sensing voltage signal by the temperature sensing current flowing through the thermosensitive insulating resin is received through the temperature-sensitive insulating resin by the pulse signal voltage, and the temperature sensing voltage signal is Accordingly, by controlling the power control element in the heating cycle, it is characterized in that the heating temperature of the electric heating mechanism is controlled.
- the temperature control device generates the pulse signal voltage by outputting an OFF/ON output signal to the gate of the power control device one or more times in the temperature sensing period to turn-OFF/ON the power control device characterized in that
- the temperature control device is characterized in that the temperature sensing period is performed for every 300 ⁇ 1000ms for 15 ⁇ 30ms.
- the temperature control device may include: a temperature sensing signal unit configured to form a temperature sensing signal voltage by sensing a temperature sensing current in which the pulse signal voltage flows to the thermal wire through the thermosensitive insulating resin; a temperature sensing control voltage converter for amplifying a signal current input from the temperature sensing signal voltage of the temperature sensing signal unit to generate a temperature sensing control voltage; an output control unit including the power control element for controlling the supply of DC power supplied to the heating wire; and transmits a control signal for a heating cycle and a detection cycle to the power control device according to a programmed process, receives a temperature sensing control voltage of the temperature sensing control voltage converter, and turns ON/OFF of the power control device of the output control unit
- a central control device comprising controlling the; It is characterized in that it includes.
- the temperature sensing signal unit is connected to one terminal S1 and the other terminal S2 of the heating wire at the first sensing node SV1, and is connected to the first sensing node SV1 and the other terminal of the heating wire.
- a first voltage sensing capacitor is connected between the first terminal nodes nd1, and a temperature sensing signal voltage according to the heating temperature of the heating wire is formed in the first voltage generating capacitor.
- the first voltage generating capacitor is characterized in that it has a capacitor capacitance value corresponding to 100 to 1000 times the capacitor capacitance of the temperature-sensitive insulating resin.
- the temperature sensing control voltage conversion unit through the third divider resistor R3 connected in series with the second divider resistor R2 from the first sensing node SV1 through the input diode D2, to a second power supply unit ( DC-), and the connection point of the second dividing resistor (R2) and the third dividing resistor (R3) is connected to the base of the current amplifying first transistor (TR1), and the current amplifying first transistor (TR1).
- the collector of the first transistor TR1 is connected to the first power supply unit DC+ of the DC power supply through the fourth resistor R4, and the emitter of the current amplification type first transistor TR1 has a second capacitor C2 It is connected to the ground through a fifth resistor R5 connected in parallel, and the emitter of the first transistor TR1 is input to the temperature sensing voltage terminal of the central control device, and the central control device is When it is determined that the temperature sensing control voltage input to the temperature sensing voltage terminal is higher than the set temperature voltage, the power control element is controlled to turn OFF.
- the temperature control device further includes an operation power supply unit for supplying a DC operation power to the internal temperature control circuit
- the temperature sensing control voltage conversion unit is an emitter of the current amplifying type first transistor (TR1) and a second capacitor ( C2) is connected to the +5V side of the operation power supply through the third diode (D3) for protection of the central controller, and the central controller has a temperature sensing voltage input to the temperature sensing voltage terminal.
- the preset normal input voltage range is 4.8V or less than 0.2V
- the power control device is controlled to TURN OFF, and then the control output of the power control device of the central control device is not restarted. It is characterized in that the control to stop.
- one terminal H1 of the heating wire is connected to the first power supply unit DC+ of the DC power supply
- the other terminal H2 of the heating wire is one terminal of the first power control element FET1 of the output control unit. and, the other terminal and one terminal of the first power control element are connected, and the other terminal of the second power control element connected in series is connected to the second power supply unit (DC-).
- the gates of the first power control device and the second power control device are respectively connected to the gate output terminals A and B of the central control device, and a sixth divider resistor ( R6) is connected in parallel, and a seventh divider resistor R7 is connected in parallel to both terminals of the second power control element, and a connection point 2 between the sixth divider resistor R6 and the seventh divider resistor R7 is connected to the operation monitoring signal terminal (SV4) of the central control device, and the connection point 2 is connected to the +5V side of the operation power unit through a fourth diode (D4), and the sixth divider resistor
- the resistance values of (R6) and the seventh dividing resistor (R7) are characterized in that the resistance values are distributed so that the monitoring voltage of the connection point 2 is set in the range of 1 to 4V in a normal temperature sensing period, and the central controller detects the temperature.
- an OFF control signal is output through the gate output terminals A and B, and the operation is not restarted thereafter. It is characterized in that the control is performed to stop the output of the gate output terminals (A, B) of the central control device.
- a heating wire using a temperature-sensitive insulating resin around the heating wire of the DC heating device accurate temperature sensing can be performed over the entire section along the heating wire, thereby preventing accurate temperature control and local overheating.
- a temperature control device can be provided.
- the installation process of a separate temperature sensor or bimetal sensor can be excluded, and a heating cable wound with a heating wire covered with a temperature-sensitive insulating resin.
- the DC heat transfer mat can be economically manufactured by a simple operation process of placing and sewing on the mat, and the temperature control device can be economically manufactured using only a minimum of electronic components.
- the temperature control device inputs a temperature sensing voltage signal by charging and discharging current flowing through the thermosensitive insulating resin to the thermosensitive wire at every sensing cycle in which a pulse signal is generated in a state in which a heating wire and a DC voltage are applied. This allows for accurate temperature sensing.
- the temperature control device can detect the temperature through the entire heating wire section even if local overheating occurs in a part of the heating wire, so it is more accurate and faster than a conventional temperature sensor and a temperature control device using a bimetal. It has the effect of being able to control the temperature.
- the temperature control device can effectively control the heating temperature by DC power with a minimum of parts by applying a simple circuit configuration, so that the workability is good, the manufacturing process can be reduced, and it is economical.
- the temperature control device configures a circuit that detects even when the insulation between the heating wire and the heating wire is broken and makes a spiral contact, so that the heating circuit can be effectively and quickly cut off.
- one of the power control elements fails due to a fault in the circuit characteristic of supplying DC power to the heating wire by connecting two power control elements in series. Even when not in use, the heating circuit can be cut off effectively and quickly.
- the temperature control device of an electric heater can reduce the generation of electromagnetic waves by using a DC power source, and there is no risk of electric shock due to a low voltage used. It has the advantage of being able to detect temperature and prevent local overheating without doing so.
- FIG. 1 illustrates a temperature control device for a DC power supply according to an embodiment of the present invention.
- FIG. 2 shows the structure of a heating cable according to an embodiment of the present invention.
- FIG. 3 shows a temperature sensing signal induced in the thermal wire SW1 in a state in which the first voltage generating capacitor C1 is not installed in the temperature control device.
- FIG. 4 is a diagram illustrating a temperature sensing signal voltage waveform input from the heat sensing wire SW1 in a state in which the first voltage generating capacitor C1 is installed in the temperature sensing signal unit 17 according to an embodiment of the present invention.
- FIG. 5 is a diagram illustrating a temperature sensing signal voltage waveform input from the heat sensing wire SW1 in a state in which the first voltage generating capacitor C1 is installed in the temperature sensing signal unit 17 according to an embodiment of the present invention; 4 shows a case where the temperature of the heating wire is high.
- TSR temperature-sensitive insulating resin
- first and second may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms.
- a component is 'connected', 'coupled' or 'connected' to another component, the component may be directly connected, coupled or connected to the other component, but the component and the other component It should be understood that another element may be 'connected', 'coupled' or 'connected' between elements.
- FIG. 1 illustrates a temperature control device for a DC power supply according to an embodiment of the present invention.
- the heating cable of the electric heating device is insulated by filling a temperature sensitive insulating resin (TSR) between the outside of the heating wire HW1 and the heating wire SW1.
- TSR temperature sensitive insulating resin
- the temperature-sensitive insulating resin refers to an insulating resin whose impedance decreases when the temperature rises, and the impedance increases when the temperature falls.
- the temperature-sensitive insulating resin is nylon resin is applied.
- Nylon resin is a dielectric that is an insulator, and it has a characteristic that the impedance is large at low temperature and the impedance decreases as the temperature increases. It has a characteristic that a discharge sensing current can flow.
- a heating cable includes a heating wire coated with a temperature-sensitive insulating resin and heated by a DC power supply; and a heat-sensitive wire spirally wound outside the coated temperature-sensitive insulating resin. It is characterized in that it includes.
- a heating wire (HW1) is formed in the center, and the heating wire (SW1) and the heat-sensitive wire (SW1) are placed close to the extent to which insulation can be maintained, and the space between them It is formed in a structure insulated with temperature-sensitive insulating resin (TSR).
- TSR temperature-sensitive insulating resin
- the heat-sensitive wire SW1 is used as a temperature-sensing wire for measuring the temperature of the temperature-sensitive insulating resin.
- FIG. 2 shows the structure of a heating cable according to an embodiment of the present invention.
- TSR temperature-sensitive insulating resin
- thermosensitive insulating resin which is an insulator for direct current, so that the temperature sensing current does not flow.
- a pulse signal current by the pulse signal voltage supplied to the heating wire HW1 is transmitted to the heating wire SW1 through the temperature-sensitive insulating resin (TSR). It may be transmitted to the heat-sensitive wire SW1 and flow to the ground side.
- TSR temperature-sensitive insulating resin
- the pulse signal current by the pulse signal voltage is transmitted to the heat-sensitive wire SW1 through the temperature-sensitive insulating resin TSR. Since the temperature-sensitive insulating resin changes its impedance according to the temperature, the current is changed according to the temperature of the temperature-sensitive insulating resin. For example, when the temperature of the thermosensitive insulating resin increases, the current by the pulse voltage increases, and when the temperature of the thermosensitive insulating resin decreases, the current by the pulse voltage decreases.
- the temperature control device senses the temperature in the temperature sensing period by using the characteristic that the current through the thermosensitive insulating resin by the pulse signal voltage changes according to the temperature as described above, and flows through the heating wire HW1. By controlling the current, it is characterized in that the heating temperature of the heating wire (HW1) is controlled.
- the temperature control device supplies DC power to the heating wire HW1 through a power control element to heat the heating wire HW1 with a heating cycle and pulses to the heating wire HW1
- the control is performed so that the temperature sensing cycle in which the signal voltage is supplied and the temperature sensing current is generated alternately.
- a temperature sensing voltage signal by a sensing current flowing through the thermosensitive insulating resin is received from the heating wire HW1 by the pulse signal voltage, and the heating cycle according to the temperature sensing voltage signal It is characterized in that by controlling the power control element to control the heat dissipation temperature of the electric heating mechanism.
- the pulse signal voltage is generated by turning the power control element supplying DC power to the heating wire (HW1) during the temperature sensing period (20 ms in one embodiment) to turn-OFF/ON operation, characterized in that do.
- a pulse signal voltage may be supplied to the heating wire during the temperature sensing period by a separate pulse generator.
- one terminal H1 of the heating wire HW1 is connected to the first power supply unit DC+ of the DC power source, and the other terminal of the heating wire HW1.
- H2 is a second power control device connected in series with the first power control device FET1 by being connected to the first terminal node nd1 to which the first terminal of the power control devices FET1 and FET2 is connected ( The circuit is configured to be connected to the ground side through the FET2).
- the second power supply unit DC- is connected to the power ground.
- one terminal S1 and the other terminal S2 of the thermal wire SW1 are connected together to the first sensing node SV1, and the other side of the first sensing node SV1 and the heating wire HW1
- a first voltage generating capacitor C1 is connected between the terminal H2 and the connected first terminal node nd1.
- a temperature sensing signal voltage is formed in the first voltage generating capacitor C1 through the heating wire SW1 according to the heating temperature of the heating wire.
- the temperature control device outputs an OFF/ON output signal to the gate of the power control device at least once in the temperature sensing period to turn-OFF/ON the power control device to generate a pulse signal voltage. characterized.
- the temperature control device in the heating cycle, the current by the DC supply voltage of the DC power flows through the heating wire HW1 and the power control elements FET1 and FET2 to heat the heating wire HW1, and , in the sensing period, the sensing current by the pulse signal voltage flows through the thermosensitive insulating resin (TSR) to the thermal wire (SW1), so that the temperature control device uses the change in the sensing current to open the power control element. / Characterized in controlling the lungs.
- TSR thermosensitive insulating resin
- a temperature control apparatus includes: an operation power supply unit 11 for supplying DC operation power to a heating wire (HW1) and a built-in temperature control circuit; a temperature sensing signal unit 17 for sensing a temperature sensing current in which the pulse signal voltage flows to the thermal wire SW1 through the thermosensitive insulating resin (TSR) to form a temperature sensing signal voltage; a temperature sensing control voltage converting unit 13 for amplifying the signal current input from the temperature sensing signal voltage of the temperature sensing signal unit 17 and converting it into a temperature sensing control voltage; an output control unit (14, 15) including a power control element for controlling the supply of DC power supplied to the heating wire (HW1); According to a programmed process, control signals for the heating cycle and temperature sensing cycle are transmitted to the power control elements 14 and 15 of the output control unit, and the temperature sensing control voltage of the temperature sensing control voltage converting unit 13 is received. a central control unit 17 for controlling ON/OFF of the output control unit and controlling each unit; and
- the DC power supply of the DC electric heater according to an embodiment of the present invention will be described as supplying DC 24V as a supply voltage. This is only an example for explaining the invention, and it can be used in all DC voltages such as 12V and 5V by applying the same technical features.
- the temperature sensing signal unit 17 has one terminal S1 and the other terminal S2 of the thermal wire SW1 connected to a first sensing node SV1, and the first sensing node
- a first voltage generating capacitor C1 is connected between SV1 and the first terminal node nd1 connected to the other terminal of the heating wire HW1.
- a temperature sensing signal voltage is formed in the first voltage generating capacitor (C1) by a current flowing through the heating wire (SW1) according to the heating temperature of the heating wire.
- the first terminal node nd1 is connected to one terminal of the first power control device FET1.
- the temperature sensing control voltage converter 13 is connected to the ground from the first sensing node SV1 through an input diode D2 and through a third divider resistor R3 connected in series with the second divider resistor R2. becomes this
- a second sensing node SV2 is formed at a connection point between the second divider resistor R2 and the third divider resistor R3, and the second sensing node SV2 is the current amplification type first transistor TR1. connected to the base.
- the collector of the current amplification type first transistor TR1 is connected to the first power supply unit DC+ of the DC power supply through a fourth resistor R4, and the emitter of the current amplification type first transistor TR1 is the second
- the capacitor C2 is connected to the ground through a fifth resistor R5 connected in parallel.
- the emitter of the first transistor TR1 is an output terminal of the temperature sensing control voltage conversion unit 13 , and is connected to the temperature sensing voltage terminal which is the third sensing node SV3 and is input to the central control unit 17
- the NPN current amplification type first transistor TR1 is connected in the emitter follower method to amplify the current. characterized in that In the temperature sensing control voltage converter 13, the first power supply (DC+) of the DC power - the fourth resistor (R4) - the collector of the current amplifying type first transistor (TR1) - the emitter - the fifth resistor (R5) - the ground The amplified current flows in the order of
- the current flowing through both ends of the fifth resistor R5 is charged in the second capacitor C2 to form a temperature sensing control voltage, and the temperature sensing control voltage is transmitted through the temperature sensing voltage terminal of the third sensing node SV3 to the microcomputer ( 20) is entered.
- the temperature sensing control voltage converter 13 further includes a first microcomputer protection circuit.
- the first microcomputer protection circuit connects the connection point of the emitter of the current amplifying type first transistor TR1 and the second capacitor C2 to the +5V side of the operation power unit through the third diode D3 for protecting the first microcomputer. .
- the voltage input to the microcomputer 20 by the first microcomputer protection circuit does not exceed +5V.
- the first microcomputer protection circuit applies a high voltage of 24V and +5V to the microcomputer 20 for reasons such as breakdown of the insulation of the thermosensitive insulating resin due to overheating, etc. This is to prevent excessive voltage from being input.
- the emitter-follower method of the first transistor TR1 is used as a method for amplifying the signal current input from the temperature sensing signal voltage in the temperature sensing control voltage converter 13, but in another embodiment, an equal means for amplifying an input voltage signal such as an OP AMP may be used instead of the NPN first transistor TR1.
- the central control device of the temperature control device may be applied to a microcomputer having a central processing unit built-in in one chip.
- the first power control device FET1 and the second power control device FET2 are in ON/TURN-OFF/TURN-ON state for 20 ms, and the heating wire HW1 )
- a pulse signal voltage of 24V-0V-24V is generated at the voltage of the first terminal node nd1 connected to the H2 terminal, which is the other terminal.
- the pulse signal voltage of 24V-0V-24V generated in the temperature sensing period varies according to the time of the temperature sensing period. The current is charged and discharged, and a temperature sensing signal appears at the point of the first sensing node SV1.
- the charging and discharging current is only 24 [V], which is very low, unlike the AC voltage of 220 [V], and the temperature sensing signal current by the very weak pulse signal voltage flows in the form of a sawtooth wave. The distinction may not be clear.
- FIG. 3 shows a temperature sensing signal induced in the thermal wire SW1 at the first sensing node SV1 in a state where the first voltage generating capacitor C1 is not installed in the temperature sensing signal unit 17 .
- the temperature sensing signal output to one terminal S1 of the heat-sensitive wire SW1 in a state where the impedance of the temperature-sensitive insulating resin placed between the heating wire HW1 and the heat-sensitive wire SW1 is large is in the form of a sawtooth wave. As it flows in a slope, the current according to the temperature change can be measured, but the classification according to the temperature change is not clearly distinguished.
- the first terminal node connected to the other terminal H2 of the first sensing node SV1 and the heating wire HW1 in order to convert the above weak sawtooth signal into a clear square wave signal. It is characterized in that the first voltage sensing capacitor (C1) is connected between (nd1).
- FIG. 4 is a diagram illustrating a temperature sensing signal voltage waveform input from the heat sensing wire SW1 in a state in which the first voltage generating capacitor C1 is installed in the temperature sensing signal unit 17 according to an embodiment of the present invention.
- FIG. 5 is a diagram illustrating a temperature sensing signal voltage waveform input from the heat sensing wire SW1 in a state in which the first voltage generating capacitor C1 is installed in the temperature sensing signal unit 17 according to an embodiment of the present invention; 4 shows a case where the temperature of the heating wire is high.
- the temperature sensing period according to an embodiment of the present invention is set to TURN-ON at a period of 400 ms and TURN-OFF-ON for 20 ms.
- the temperature sensing signal voltage can be clearly displayed as a square wave.
- the capacitor of the thermosensitive insulating resin increases from 3 nF to 10 nF. This is because the impedance decreases as the temperature increases due to the characteristics of the temperature-sensitive insulating resin (TSR).
- a sine wave AC of 60 Hz is supplied from commercial AC power, but a square wave of 2 to Hz is supplied for the pulse signal voltage used for the temperature sensing period according to an embodiment of the present invention.
- the power consumption of the heating wire HW1 is reduced. That is, as the pulse signal increases in the temperature sensing period (the frequency increases), the power consumption used for heating the heating wire HW1 decreases.
- TSR temperature-sensitive insulating resin
- the temperature sensing signal current flowing through the temperature-sensitive insulating resin (TSR) is lower than the AC voltage even though the capacitor is the same. A disadvantage of being small may occur.
- a first voltage is sensed between the first sensing node SV1 and the first terminal node nd1, to which one terminal S1 and the other terminal S2 of the thermal wire are connected. It is characterized in that by connecting the capacitor C1, the pulse waveform in which the temperature signal current is accumulated in the first sensing node SV1 is clearly displayed.
- the capacity of the first voltage generating capacitor C1 is preferably 0.3 to 3uF, which corresponds to 100 to 1000 times the capacity of the capacitor of the thermosensitive insulating resin at room temperature.
- FIG. 4 shows an initial waveform in a state in which the first voltage generating capacitor C1 having a capacity of 1 uF is installed.
- the first sensing node SV1 is measured using a 100:1 probe
- the second sensing node SV2 is measured using a 1:1 probe.
- thermosensitive insulating resin TSR
- HW1 initial heating wire
- the waveform of the first sensing node SV1 shows -20 [V] in the heating cycle in which the heating current flows, and the heating current does not flow.
- the voltage of the square wave pulse waveform appears as +4[V].
- the sensing current flows in the order of the input diode D1 - the second dividing resistor R2 - the third dividing resistor R3 - the ground, so that the voltage across the third dividing resistor R3 A waveform appears.
- the capacitor of the temperature-sensitive insulating resin (TSR) is increased. That is, as described above, when the temperature of the temperature-sensitive insulating resin (TSR) rises to 90°C as described above, the capacitor of the temperature-sensitive insulating resin increases in capacity from 3 [nF] to 10 [nF].
- the waveform of the first sensing node SV1 is -10 [V] in the heating cycle and about +15 [V] or more appears in the temperature sensing cycle. In addition, it can be seen that a pulse waveform of 15 [V] appears in the temperature sensing period at the second sensing node SV2.
- a pulse signal voltage is generated only by the operation of turning the power control device OFF/ON in a short time during the temperature sensing period, so that the temperature sensing signal voltage according to the temperature change is transferred to the first sensing node ( It can be seen that SV1) and the second sensing node SV2 are generated.
- the temperature sensing signal voltage waveform is generated as the temperature rises, the current is weak, so it may have a weakness that is difficult to analyze in the microcomputer.
- the temperature sensing signal voltage is clearly distinguished in the range of 0 to 5 [V]. It characterized in that it further comprises a temperature sensing control voltage conversion unit 13 for converting the temperature sensing control voltage.
- the temperature sensing control voltage converter 13 of the present invention amplifies and converts the signal current using the emitter-follower method of the NPN transistor.
- the sensing signal voltage input from the temperature sensing signal unit 17 is input to the base of the current amplifying first transistor TR1 and the current amplified is performed. After that, the signal output to the emitter is converted and used as a temperature sensing control voltage signal.
- the temperature sensing control voltage signal output from the temperature sensing control voltage conversion unit 13 is input to the central control unit 17, MACOM, and the microcomputer receives the input temperature sensing control voltage signal.
- a control signal is sent to the gates of the power control elements (FET1, FET2) of the output control units 14 and 15 to control the power supply of the heating wire (HW1), thereby smoothing the ignition temperature. be able to control
- the central control unit 17 includes a central processing unit in one chip, such as an arithmetic processing unit, a memory unit, an input/output unit, etc. by LSI (large scale integration) in a microprocessor.
- LSI large scale integration
- a microcomputer chip to which is added is used.
- the operation power supply unit 11 supplies a 5V DC voltage as a control voltage of each unit.
- the operation power supply unit 11 includes a power switch SW1 for switching the opening and closing (ON/OFF) of the operation power supply.
- the temperature setting unit 12 may select a desired set temperature by adding or subtracting a resistance value of the variable resistor VR1 by a user.
- the central control unit 17 compares the voltage corresponding to the set temperature selected by the temperature setting unit 12 with the temperature sensing control voltage signal input from the temperature sensing control voltage converting unit 13, and the temperature sensing control voltage signal is set at the set temperature. If it is lower than the corresponding voltage of , the output of the central control unit 17 is maintained as an ON signal. In addition, if the input temperature sensing control voltage signal is higher than the voltage corresponding to the set temperature, it is programmed to output the A and B outputs of the central control unit 17 as an OFF signal.
- the central control unit 17 generates a temperature measurement pulse signal that periodically outputs an OFF-ON signal to the A and B output terminals in the set temperature sensing period.
- the temperature measurement pulse signal according to an embodiment of the present invention is characterized in that it is generated by outputting LOW/HIGH signals to the gates of the first and second power control elements (FET1, FET2) one or more times during a time set in the temperature sensing period. .
- the ON-TURN OFF-TURN ON operation of the first and second power control elements FET1 and FET2 is performed at a set time of 20 ms by the temperature measurement pulse signal, so that the heating wire HW1 An instantaneous pulse voltage is applied. .
- the central controller 17 maintains the ON signal in the set heating cycle, and outputs the Off-ON output signal to A and B for a set time in the temperature sensing cycle to turn OFF the power control elements FET1 and FET2 - TURN ON.
- the central control unit 17 supplies a pulse signal voltage which is turned OFF - TURN ON, which is periodically generated for each temperature sensing period, to the heating wire HW1, so that the temperature sensing current flowing through the temperature-sensitive insulating resin (TSR) It is characterized in that the FET1 and FET2 are controlled by receiving the temperature sensing signal by the temperature sensing control voltage.
- the central control device 20 supplies DC power to the heating wire HW1 through a power control element to generate a heating cycle for heating the heating wire HW1 and pulses to the heating wire HW1.
- the control is performed to alternately have the temperature sensing cycle to generate the temperature sensing current by supplying the signal voltage.
- the temperature sensing cycle is performed for 15 to 30 ms every 300 to 1000 ms.
- the power control elements (FET1, FET2) maintain the ON state, DC power is supplied to the heating wire (HW1), and then for 15 ⁇ 30ms, the power control elements (FET1, FET2) turn OFF-TURN ON
- the temperature measurement pulse signal voltage is supplied to the heating wire (HW1).
- the A and B output terminals are kept ON signal (HIGH) for 400 ms, the OFF-ON (LOW-HIGH) signal is output for the following 20 ms, and then For another 400ms, the ON (HIGH) signal is controlled so that it is performed alternately. That is, the heating current flows for 400 ms, and the heating current does not flow for 20 ms.
- the ratio of the heating cycle to the temperature sensing cycle was set to 20:1. This ratio can be changed to 30:1, 40:1, or 50:1 depending on the purpose of the power device. As the ratio increases, the efficiency of the current flowing to the heating wire HW1 may be improved, but the frequency of temperature sensing may decrease, so that the temperature sensing efficiency may decrease. Therefore, this ratio can be applied variably according to the type, thickness, and length of the heating wire of the temperature-sensitive insulating resin.
- the first power supply unit DC+ may further include a fuse unit F1 that blocks the circuit when an overcurrent equal to or greater than a set current flows between one terminal H1 of the heating wire HW1.
- thermosensitive insulating resin When a direct current flows, the temperature of the thermosensitive insulating resin increases due to the heat of the heating wire, and the impedance of the thermosensitive insulating resin decreases.
- the temperature sensing control voltage of the third sensing node SV3 to which the output of the temperature sensing control voltage converting unit 13 is connected increases and becomes an input.
- the output signal is HIGH through the output terminals A and B of the central control unit 17 ⁇
- the first and second power control elements FET1 and FET2 are controlled to TURN OFF.
- the first and second power control elements are turned OFF so that the heating current does not flow. do.
- the central control unit 17 When the temperature sensing control voltage signal input from the third sensing terminal SV3 is lower than the voltage set by the temperature setting unit 12 according to the sequence programmed in the central control unit 17, the central control unit 17 outputs By switching the output signal from LOW to HIGH through terminals A and B, the first and second power control elements FET1 and FET2 are controlled to turn ON again. By repeating this process, the heating temperature by the heating wire HW1 can be kept constant within the set temperature range.
- the temperature sensing control voltage signal when a failure such as insulation breakdown of the thermosensitive insulating resin, a failure of the power control device, or an internal failure of the temperature control device occurs, the temperature sensing control voltage signal is It is characterized in that the circuit is configured so that it is input outside the range of the preset normal input voltage.
- the central control device 17 if it is determined that the temperature sensing control voltage signal is out of the preset normal input voltage range while the operating power is turned on, the first and second power control The devices (FET1, FET2) are set and controlled by a program to turn OFF.
- the control is performed to stop the A and B outputs of the central control unit 17 so that the operation is not restarted.
- it may further include a configuration for controlling the LED of the display unit 16 to blink in a warning form at the same time so that the user can recognize it.
- the range of the preset normal input voltage as described above in the central control unit 20 is set to a maximum value of 4.8V to a minimum value of 0.2V.
- the local overheated part of the entire section of the heating wire has the highest temperature, and if this phenomenon continues, it may lead to a fire.
- the nylon resin impedance of the entire section placed between the heating wire and the heat-sensitive wire is in a state of being configured in parallel.
- the temperature of the resin also rises.
- the temperature of the local overheating part becomes above the set temperature, and the temperature sensing control voltage of the third temperature sensing node SV3 by the temperature sensing signal voltage of the first temperature sensing node SV1 rises beyond the set voltage range. do.
- the central control device 17 senses the temperature sensing signal voltage due to such a local temperature rise, and converts the output signal from HIGH to LOW through the output terminals A and B to convert the first and second power control elements FET1 , FET2) can be turned OFF to prevent overheating by cutting off the DC power supply.
- thermosensitive insulating resin is destroyed by overheating or an external environment, which may cause a short circuit between the heating wire and the sensing wire.
- the current flows in the order of the first power supply (DC+) - F1 - H1 - heating wire (HW1) - short part - thermal wire (SW1) - S1, S2 - D2 - R2 - R3 - ground. do.
- a DC power of 24V is distributed to the second and third distribution resistors, so that a high temperature detection signal voltage of 10V or more is applied. Accordingly, a large amount of current flows to the emitter side of TR1 of the temperature sensing control voltage converter 13 according to an embodiment of the present invention, and the voltage across the second capacitor C2 exceeds 5V.
- a voltage exceeding 5 [V] is applied to the third sensing node SV3 connected to the second capacitor C2 by the first microcomputer protection circuit including the voltage limiting diode D3. It flows to the operation power unit 11 by the three diodes D3, and the maximum voltage is limited so that 5 [V] is input. .
- the third detection node SV3 which is the input terminal of the central control device 17, is subjected to temperature sensing control.
- a voltage signal of 5V is input.
- the central control unit 17 determines that the input exceeds the preset normal input voltage range (4.8 to 0.2 [V]), and the first and second The power control elements (FET1, FET2) are controlled to turn OFF.
- FET1, FET2 The power control elements
- the switching control cannot be controlled due to a failure of the switching element when used for a long period of time. If the switching control is not performed in this way, even if a LOW signal is sent to the gate due to overheating, the switching element remains ON, which may lead to an accident due to overheating.
- the temperature control device in order to prevent such a failure type, two power control elements are connected in series to the configuration of the output control units 14 and 15, and the central control unit 17 simultaneously gates It is characterized in that it is configured to transmit the same control signal to the gates of the two power control elements through the output terminals (A, B).
- one terminal H1 of the heating wire HW1 is connected to the first power supply unit DC+ of the DC power
- the other terminal H2 of the heating wire HW1 is the first power It is connected to one terminal of the control element FET1
- the other terminal of the first power control element FET1 is connected to the other terminal and the other terminal and the other terminal of the second power control element FET2 connected in series to the other terminal of the DC power supply unit is connected to the second power supply (DC-) of Gates 1 and 2 of the first power control device FET1 and the second power control device FET2 are respectively connected to the first and second gate output terminals A and B of the central control device 17, and the central The control device 17 always transmits the same control signal to the first and second gate output terminals A and B.
- a sixth divider resistor R6 is connected in parallel to both terminals of the first power control element FET1
- a seventh divider resistor R7 is connected in parallel to both terminals of the second power control element FET2.
- the connection point of the sixth divider resistor R6 and the seventh divider resistor R7 is connected to the operation monitoring signal terminal SV4 of the central control unit 17 .
- the connection point is connected to the +5 [V] side of the operation power unit through the fourth diode D4 for protecting the second microcomputer.
- a voltage exceeding 5 [V] is applied to the operation signal detection terminal SV4 connected to the connection point by the second microcomputer protection circuit including the fourth diode D4.
- the temperature control device is such that the monitoring voltage of the connection point of the sixth distribution resistor R6 and the seventh distribution resistor R7 is set in the range of 1 to 4 [V] in the temperature sensing period. It is characterized in that the resistance values of the sixth and seventh distribution resistors R6 and R7 are distributed in the range of 23 to 21: 1 to 3 to distribute the resistance values.
- the central control unit 17 turns OFF the first and second gate output terminals (A, B) when a voltage is input to the operation signal detection terminal (SV4) exceeding or less than the range of the normal monitoring voltage set in the temperature detection period.
- a control signal (LOW signal) is output, and control is performed to stop the A and B outputs of the central control unit 17 so as not to restart the operation thereafter.
- the central control unit 17 controls the LED of the display unit 16 to blink in a warning form at the same time.
- the resistance values of the sixth divider resistor (R6) and the seventh divider resistor (R7) are divided by 21.5: 2.5 so that the monitoring voltage has a voltage value of 2.5V in the temperature sensing period.
- the central control device 17 receives a voltage exceeding 3 [V], which is the range of the normal monitoring voltage in the temperature sensing period, or a voltage less than 2 V is input to the operation signal detection terminal SV4, the first and second The OFF control signal (LOW signal) is output to the gate output terminals A and B, and the control is performed to stop the output of the first and second gate output terminals A and B so that the subsequent process does not proceed.
- the output control units 14 and 15 include a configuration in which the first power control device FET1 and the second power control device FET2 are connected in series as described above, thereby controlling any one of the power Even if the device is short-circuited, it has the effect of safely shutting off the heating circuit.
- FET1 and FET2 are in the ON state for 400 ms, and alternately in the OFF state for 20 ms, which is the subsequent temperature sensing period, and current flows through the heating wire HW1.
- FET1 and FET2 are in the ON state and the other terminal is connected to the ground, so the ground potential 0 [V] appears at the operation signal sensing terminal SV4.
- one terminal of the sixth divider resistor R6 and the other terminal of the seventh divider resistor R7 are A voltage of 24V is applied.
- the resistance values of the 6th divider resistor (R6) and the 7th divider resistor (R7) are distributed as 21.5:2.5, so when it operates normally, the monitoring voltage of the operation signal detection terminal (SV4) is 2.5V to the microcomputer (20). is input
- the sixth distribution resistor R6 is in a short-circuited state by the first power control element FET1 connected in parallel.
- a 24V pulse voltage is applied to both ends for 20 ms, and accordingly, the maximum voltage 5 [V] is input to the monitoring voltage of the operation signal detection terminal SV4 by the second microcomputer protection circuit.
- the central control unit 17 determines that a voltage exceeding 3 [V] is input to the operation signal detection terminal SV4, and provides an OFF control signal (LOW signal) to the first and second gate output terminals A and B. By outputting , the second power control device FET2 is turned OFF, so that the DC power supply of the heating wire HW1 may be cut off.
- the seventh distribution resistor R7 is short-circuited by the second power control element FET2 connected in parallel, so the operation signal detection terminal ( SV4) is input with 0[V], which is the ground potential.
- the central control unit 17 determines that a voltage of less than 2 [V] is input to the operation signal detection terminal SV4 and applies an OFF control signal (LOW signal) to the first and second gate output terminals A and B. By controlling the output, the first power control device FET1 is turned OFF, so that the DC power supply of the heating wire HW1 can be cut off.
- OFF control signal LOW signal
- the central control device 17 determines that a voltage less than the normal monitoring voltage range is input to the operation signal detection terminal SV4, and provides an OFF control signal LOW to the first and second gate output terminals A and B. signal), and then stops the process and at the same time controls the LED of the display unit 16 to blink in a warning form. Therefore, the user can immediately detect the failure situation.
- the temperature control apparatus of an electric heating appliance using a DC power source can accurately control the temperature by accurately detecting a temperature change over the entire length of the heating wire.
- the temperature control device of an electric heating appliance using a DC power source quickly detects a failure due to local overheating, a spiral contact due to insulation breakdown of a heating wire, or a breakage of a heating wire. By blocking and providing a notification means by blinking the LED, it is possible to safely protect the electric heating device.
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Abstract
Description
Claims (10)
- 직류전원을 사용하는 전열기구의 온도제어장치에 있어서,상기 전열기구의 발열케이블은,감온성 절연수지로 피복되고 상기 직류전원에 의해 발열되는 발열선; 및상기 피복된 감온성 절연수지 외부를 나선형으로 감은 감열선; 을 포함하며,상기 온도제어장치는,상기 직류전원을 전력제어소자를 통해 상기 발열선에 공급하여 상기 발열선을 발열시키는 발열주기와 상기 발열선에 펄스신호 전압을 공급하여 온도 감지전류를 발생시키는 온도감지 주기를 번갈아 가지도록 제어를 하며,상기 온도감지 주기에는 상기 펄스신호 전압에 의해 상기 감온성 절연수지를 통해 상기 감열선에 흐르는 상기 온도 감지전류에 의한 온도감지 전압신호를 입력받아서, 상기 온도감지 전압신호에 따라 상기 발열주기에 상기 전력제어소자를 제어하여 상기 전열기구의 발열온도를 제어하는 것을 특징으로 하는 온도제어장치.
- 제1항에 있어서,상기 온도제어장치는 상기 온도감지 주기에 OFF/ON 출력신호를 상기 전력제어소자의 게이트로 1회 이상 출력하여 상기 전력제어소자를 TURN-OFF/ON 시키는 것에 의해 상기 펄스신호 전압을 생성시키는 것을 특징으로 하는 온도제어장치.
- 제1항에 있어서,상기 온도제어장치는 상기 온도감지주기를 300 ~ 1000ms 마다 15 ~ 30ms 동안 수행되는 것을 특징으로 하는 온도제어장치.
- 제1항에 있어서,상기 온도제어장치는상기 펄스신호 전압이 상기 감온성 절연수지를 통하여 상기 감열선으로 흐르는 온도 감지전류를 감지하여 온도감지 신호전압을 형성하는 온도감지 신호부;상기 온도감지 신호부의 온도감지 신호전압으로부터 입력된 신호전류를 증폭하여 온도감지 제어전압을 발생하는 온도감지 제어전압 변환부;상기 발열선에 공급하는 직류전원의 공급을 제어하는 상기 전력제어소자를 포함하는 출력제어부; 및프로그램된 프로세스에 따라 상기 전력제어소자에 발열주기 및 감지주기에 대한 제어신호를 전송하고, 상기 온도감지 제어전압 변환부의 온도감지 제어전압을 입력받아 상기 출력제어부의 상기 전력제어소자의 ON/OFF를 제어하는 것을 포함하는 중앙제어장치; 를 포함하는 것을 특징으로 하는 온도제어장치.
- 제4항에 있어서,상기 온도감지 신호부는상기 감열선의 일측 단자(S1)와 타측 단자(S2)는 제1감지노드(SV1)에서 접속이 되며, 상기 제1 감지노드(SV1)와 상기 발열선의 타측 단자에 접속된 제1단자노드(nd1) 사이에 제1 전압감지 콘덴서를 접속하는 것을 특징으로 하며, 상기 제1 전압생성 콘덴서에 상기 발열선의 발열온도에 따른 온도감지 신호전압이 형성되는 것을 특징으로 하는 온도제어장치.
- 제5항에 있어서,상기 제1 전압생성 콘덴서는 상기 감온성 절연수지의 캐패시터 용량의 100 ~ 1000 배에 해당하는 캐패시터 용량값을 가지는 것을 특징으로 하는 온도제어장치.
- 제5항에 있어서,상기 온도감지 제어전압 변환부는, 상기 제1감지노드(SV1)로부터 입력단 다이오드(D2)를 거쳐서 제2분배저항(R2)과 직렬로 연결된 제3분배저항(R3)을 거쳐서 제2 전원부(DC-)와 접속이 되며,상기 제2분배저항(R2)과 제3분배저항(R3)과의 접속점은 전류 증폭형 제1트랜지스터(TR1)의 베이스와 접속이 되고,상기 전류 증폭형 제1트랜지스터(TR1)의 컬렉터는 제4저항(R4)를 거쳐서 상기 직류전원의 제1 전원부(DC+)와 접속되며,상기 전류 증폭형 제1트랜지스터(TR1)의 이미터는 제2콘덴서(C2)가 병렬로 접속된 제5저항(R5)를 거쳐서 상기 제2 전원부(DC-)와 연결이 되며, 상기 제1트랜지스터(TR1)의 이미터는 중앙제어장치의 온도감지 전압단자로 입력되는 것을 특징으로 하고,상기 중앙제어장치는 상기 온도감지 전압단자로 입력된 온도감지 제어전압이 설정된 온도전압보다 높은 것으로 판단이 되면, 상기 전력제어소자를 TURN OFF로 제어하는 것을 특징으로 하는 온도제어장치.
- 제7항에 있어서,상기 온도제어장치는 내부 온도제어 회로에 직류 동작전원을 공급하는 동작전원부를 더 포함하며,상기 온도감지 제어전압 변환부는 상기 전류 증폭형 제1트랜지스터(TR1)의 이미터와 제2콘덴서(C2)의 접속점에 상기 중앙제어장치 보호용 제3다이오드(D3)를 통하여 상기 동작전원부의 + 5[V]측에 연결하는 것을 특징으로 하고,상기 중앙제어장치는 상기 온도감지 전압단자에 입력되는 온도감지전압이 미리 설정된 정상 입력전압의 범위인 4.8[V]를 초과하거나, 0.2[V]미만인 것으로 판단이 되면, 상기 전력제어소자를 TURN OFF로 제어를 하고, 이후 재가동을 하지 않도록 중앙제어장치의 상기 전력제어소자의 제어출력을 정지하도록 제어하는 것을 특징으로 하는 온도제어장치.
- 제4항에 있어서,상기 발열선의 일측 단자(H1)는 상기 직류전원의 제1 전원부(DC+)와 접속되고,상기 발열선의 타측 단자(H2)는, 상기 출력제어부의 제1 전력제어소자(FET1)의 일측 단자와 접속되며, 상기 제1 전력제어소자의 타측단자와 일측단자가 접속되어 직렬로 연결된 제2 전력제어소자의 타측단자가 제2 전원부(DC-)와 접속되는 것을 특징으로 하는 온도제어장치.
- 제9항에 있어서,상기 제1 전력제어소자와 제2 전력제어소자의 게이트는 각각 상기 중앙제어장치의 게이트 출력단자(A, B)에 연결되며,상기 제1 전력제어소자의 양측단자에는 제6분배저항(R6)이 병렬로 접속되고, 상기 제2 전력제어소자의 양측단자에는 제7분배저항(R7)이 병렬로 접속되고, 상기 제6분배저항(R6)과 제7분배저항(R7)가 접속되는 접속점2는 중앙제어장치의 동작감시신호단자(SV4)와 접속이 되고,상기 접속점2는 제4다이오드(D4)를 통하여 상기 동작전원부의 +5V 측에 연결이 되고, 상기 제6분배저항(R6)과 제7분배저항(R7)의 저항값은 상기 접속점2의 감시전압이 정상적인 온도 감지주기에서 1 ~ 4[V] 범위 중에서 설정되도록 저항값을 배분한 것을 특징으로 하며,상기 중앙제어장치는 온도 감지주기에서 상기 동작신호감지단자(SV4)에 설정된 정상 감시전압의 범위를 초과하거나, 미만인 전압이 입력되면, 상기 게이트 출력단자(A, B)를 통하여 OFF 제어신호를 출력하고, 이후 재가동을 하지 않도록 상기 중앙제어장치의 상기 게이트 출력단자(A, B)의 출력을 정지하도록 제어를 하는 것을 특징으로 하는 온도제어장치.
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US18/282,598 US20240188193A1 (en) | 2021-03-23 | 2022-01-06 | Smart heating controller of DC heating device |
JP2023549117A JP2024512233A (ja) | 2021-03-23 | 2022-01-06 | 直流電熱器具のスマート温度制御装置 |
CN202280025643.4A CN117099480A (zh) | 2021-03-23 | 2022-01-06 | 用于直流加热装置的智能加热控制器 |
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JPH0554957A (ja) * | 1991-08-27 | 1993-03-05 | Matsushita Electric Works Ltd | 感熱発熱体の温度制御装置 |
KR20070076032A (ko) * | 2006-01-17 | 2007-07-24 | 김동열 | 전열매트 온도제어기 |
KR20100130820A (ko) * | 2009-06-04 | 2010-12-14 | 주식회사 보국전자 | 전열기구의 온도제어장치 및 그 안전장치 |
KR20140036455A (ko) * | 2012-09-14 | 2014-03-26 | 주식회사 솔고 바이오메디칼 | 온열기기용 온도제어회로 |
KR20160001962A (ko) * | 2014-06-30 | 2016-01-07 | 길종진 | 프리볼트 온도조절 장치 및 방법 |
KR20180031401A (ko) * | 2016-09-20 | 2018-03-28 | 메가보일러 주식회사 | 전열기구용 펄스전류 인가 제어장치 및 제어방법 |
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KR200296244Y1 (ko) | 2002-08-23 | 2002-11-29 | 강청원 | 전자 매트용 직류 자동온도 조절기 |
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Patent Citations (6)
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JPH0554957A (ja) * | 1991-08-27 | 1993-03-05 | Matsushita Electric Works Ltd | 感熱発熱体の温度制御装置 |
KR20070076032A (ko) * | 2006-01-17 | 2007-07-24 | 김동열 | 전열매트 온도제어기 |
KR20100130820A (ko) * | 2009-06-04 | 2010-12-14 | 주식회사 보국전자 | 전열기구의 온도제어장치 및 그 안전장치 |
KR20140036455A (ko) * | 2012-09-14 | 2014-03-26 | 주식회사 솔고 바이오메디칼 | 온열기기용 온도제어회로 |
KR20160001962A (ko) * | 2014-06-30 | 2016-01-07 | 길종진 | 프리볼트 온도조절 장치 및 방법 |
KR20180031401A (ko) * | 2016-09-20 | 2018-03-28 | 메가보일러 주식회사 | 전열기구용 펄스전류 인가 제어장치 및 제어방법 |
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US20240188193A1 (en) | 2024-06-06 |
KR102462345B1 (ko) | 2022-11-04 |
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